Section 283. No person shall maintain any slot machines or other automatic device, except gas meters, electric meters and telephones, which, upon the deposit therein of any coin or other article of value, furnishes music, or other entertainment, exhibits pictures, provides facilities for weighing, supplies any merchandise or other thing, or renders any service, or is represented to do or perform any of the above mentioned things, unless such machine or device is of a type approved by the director of standards; but no person maintaining such machine or device with respect to which, or to the operation, service or supply of which, there is any element of chance shall be protected or be entitled to immunity from prosecution because of such approval.